Johann franz edtjard woldemar schmidt



(No Model.)

J. P. E. W. SCHMIDT. REGBNERATIVE LAMP.

No. 408,197. Patented July 30, 1889..

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UNITED STAT S PATENT OFFICE.

JOHANN FRANZ EDUARD woLDEMAR SCHMIDT, OF DRESDEN, SAXONY,

' GERMANY.

REGENERATlVE-LAM P.

SPECIFICATION forming part of Letters Patent No. 408,197, dated July 30, 1889.

Application filed January 21,1889. Serial No. 297,081. (No model.) Patented in England December 11, 1888,11'0. 18,066; in Switzerland December 15, 1888,110. 184: in France December 17, 1888, No. 194,818; in Belgium December 17, 1888, No. 84,816; in Spain December 21,1888,No. 9,020; in Italy December 31, 1888, No. 24,599, and in Denmark April 25, 1889, No-

To all whom it may concern.-

Be it known that l, J OHANN FRANZ EDUARD WOLDEMAR SCHMIDT, a citizen of Germany, residing at Dresden, Germany, have invented certain new and useful Improvements in Regenerative Lamps, (for which I have obtained Letters Patent in Italy, No. 24,599, dated December31, 1888; England, No.18,066, dated December 11, 1888; Spain, No. 9,020, dated December 21, 1888; France, No. 194,818, dated December 17, 1888; Belgium, No. 84,316, dated December 17 1888; Switzerland, No.184, dated December 15, 1888, and Denmark, No. 1,266, dated April 25, 1889,) of which the following is a full, clear, and exact specification;

This invention relates to that type of lamp having a burner and two globes wherein the light is radiated downward.

The object of my invention is'to provide novel means whereby the circle of light is enlarged and softened, the ceiling is illuminated, and cool air admitto'd through an unobstructed orifice in the bottom of an external shadeglobe is caused to ascend between the two globes and escape at the open top of the external globe for carrying oflf the heat developed by the flame from a pendent burner.

The object of the invention is accomplished by the novel construction and combination of devices hereinafter described and claimed, reference being made to the accompanying drawings, in which- Figure 1 is a side elevation of part of a lamp showing my invention, the shade-globe and its retaining-ring being in section. Fig. 2 is a similar view showing a variation in the configuration of the shade-globe. Fig. 3 is a detail plan view of the retaining-ring; and Fig. 4 is a sectional view of the same, taken through the hinge of the ring-sections.

In order to enable those skilled in the art to make and use my invention, I will now describe the same in detail, referring to the drawings, wherein- The letterAindicates an inverted pendent burner; d, a circular flange comprising part of the lamp-frame, and G the transparent burner-globe having imperforate bottom and side walls, and in which the pendent burner hangs, all substantially as in the Wenham regencrat-ive-burner lamps. The burner-globe G, suspended from the lamp-frame, as usual, is inclosed within a shade-globe M, composed of translucent vitreous material such as milk-glassand provided at its open top with a lateral] y-proj ectin g annular flange r and at the center of its bot-tom wall with a free or unobstructed air-inlet orifice O.

The shade-globe retaining-ring R is composed of two semicircular ring-sections united at one end by a hinge or pivot c and detachably connected by a suitable catch h, so that the ring can be opened and closed to engage under the flange r of the shade-globe and thereby suspend it from the flange or lampframe D, through the medium of hooks 3, secured to or formed with each ring-section, as shown in Fig. 1. Instead, however, of the ring engaging the flange r and the hooks catching over the flange or lam p-frame D, the parts may be arranged as in Fig. 2, where the ring rests on the lamp-frame and the hooks engage the flange of the shade-globe.

The configuration of the shade-globe diifers from that of the burner-globe, and the rays of downwardly-radiated light are dispersed and the circle of light materially enlarged, while the ceiling is illuminated. The difference in configurationresides more particularly in. the fact that the curved walls of the shade-globe are eccentric to. the imperforate curved walls of the burner-globe.

The shade-globe may have the form of a flattened ball, as in Fig. 1, or of a ball of spherical section, as in Fig. 2.

The orifice in the bottom of the shade-globe constantly admits cool atmospheric air, and the entering air, absorbing the heat radiating from the burner-globe, creates an upward current that discharges through the open top of the shade-globe, thereby causing a continuous circulation of air upward through the shade-globe to carry off the heat developed by the flame and keep the two globes comparatively cool. The form of the shadeglobe is such that by its laterally-expanded walls the ceiling is illuminated, which in this type of lamps has not heretofore been accomplished. by my invention I provide a novel lamp havmg a pendent burner located in the transparent burner-globe, the walls of which are imperforate,wherein the circle of downwardlyradiating light is materially enlarged, the ceiling is illuminated, and the heat developed by the flame is carried off by ascending currents of air constantly rising through the unobstructed opening in the shade-globe and passing between the two globes out through the open top of the exterior translucent globe.

By means of the retaining-ring the shadeglobe can be removed and replaced at will whenever occasion requires.

Having thus described my, invention, what I claim is 1. The combination of a lamp-frame, a transparent burner-globe having imperforate bottom and side walls and suspended from the lamp-frame, a pendent burner in the burner-globe, and a translucent shade-globe, also suspended from the lamp-frame and inclosing Within it the burner-globe for enlarging the circle of downWardly-radiating light, substantially as described.

2. The combination of a lamp-frame, a pendent burner, a burner-globe suspended from the lamp-frame, and a translucent shadeglobe suspended from the lamp-frame, inclosing Within it the burner-globe and having its curved Walls eccentric to the curved walls of the burner-globe for enlarging the circle of downwardly-radiating light, substantially as described.

3. The combination, with a lamp-frame, a burner-globe suspended therefrom and having imperforate bottom and side Walls, and a pendent burner in the burner-globe, of the translucent sh ade-globe, inclosin g the burnerglobe and detachably connected at its open top with the lamp-frame for enlarging the circle of downwardly-radiating light, substantially as described. v

4. The combination of a lamp-frame, a burner-globe suspended therefrom and having imperforate bottom and side Walls, a pendent burner in the burner-globe, and a translucent shade-globe suspended from the lamp-frame, inclosing the burner-globe and provided at its bottom with an unobstructed air-inlet orifice for. the constant admission of ascending currents of cool air, which rise between the globes and discharge at the open top of the shade-globe, substantially as described.

In testimony whereof Iaffix my signature in presence of two Witnesses.

JOHANN FRANZ EDUARD WOLDEMAR SCHMlD'l.

WVitnesses:

CARL FR. KEIOHELT, PAUL DRUOKMULLER. 

